The results were a major increase in power throughout the entire rev range, with an increase of 60hp at 4500rpm through to a peak of 279hp at 5800rpm. Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. The HP DIFF column on the far right lists the horsepower difference between Test 1 and Test 3. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Ford Factory 5.0 Performance Cylinder Heads. Compare. Mar 23, 2004. Sponsored. All costing in the end at least another $2k. Now he serves as a regular contributor to OnAllCylinders. As you might expect with more duration, the idle quality dropped significantly but was still able to make 11.5 inches of vacuum at 980 rpm. I have been working on Fords for 40 years and I have experimented with a few tricks of my own. Is asking advice for a fairly common situation involving parts with mandatory compatibility between the two for performance and longevity. MAC is the only manufacturer of these headers, and the parts we installed fit like a glove with no problems whatsoever. We didn't increase the valve size, although we did have to add Manley valves to get the proper spring-installed height. I can tell you that with my 9.503 block, 22cc dished pistons and 64cc heads, I'm at 9.5:1 compression. BONUS TEST-FOUR DIFFERENT 302 INTAKES.. Not to mention, they will run circles around GT40P's out of the box. I have a 66 mustang with its original untouched 289 with over 140 k on it that Ive been running a blow thru turbo making 14 lbs of boost on for the last 5 years and its never given me a problem. They suffered from poor aftermarket support up until about 15 years ago when it really came on strong. The longer duration created a slight loss of torque below 3,300 rpm compared to both previous cams, but beyond that mild loss of power, the bigger Voodo out-powered its smaller cousin, cranking out a peak torque of 355 lb-ft at 4,300 (a gain of 7 lb-ft over Test 2) and charging to a peak horsepower of 376 at 6,000 rpm. You just want to keep it out of detonation. Works on all factory cast iron E7, GT40, and GT40P cylinder heads! He'll have to get a gear for his distributor. In review, we rescued a used 5.0L Ford from the boneyard, ported the heads, added a cam, carburetor, intake manifold, and headers, and pulled an amazing 376 hp out of the mix. Install a set of GT-40P cylinder heads from a late 1990's Ford Explorer or a set of GT40 heads from an early 1990's Mustang 5.0L. It's an 86 roller 5.0 engine that had a recent rebuild sometime in the past with keith black pistons, otherwise stock. We started with a 120,000-mile 5.0L out of a Ford Explorer, removed the EFI and DIS, and pocket ported the stock GT40P iron heads with stock valve sizes. Yea. Step 1. It runs smooth but seems lazy. The MPH was there to run a little better but the local track is about terrible. I had those on my car before I upgraded and they were nice heads. Seriously though if you're not planning on an all-out attack for HP, I'd consider a forged piston out of Probe's SRS line-up. Also, the spark plug angle makes it a pain. $139.99. I'm new and I'm currently building a 302 on a budget and want to raise compression without milling heads but by pistons and I want to get close to 10:1. Within a few hours of his discovery, the engine was sitting in the back of his truck on its way to a new home. Rowe studied engineering, philosophy and American literature at Central Florida Community College. It turned out we were conservative on both counts. Smith began writing for Car Craft magazine in 1979 and became editor in 1984. You didnt mention the car this engine is in, but lets assume there is enough room to remove the radiator and any other coolers and perhaps some or all of the front grille and/or brackets before the cam has sufficient room to exit the front of the engine. I think one of the finer traits of a true car guy, is the patience to put a prized car away and just let it sit for a while rather than selling it when life gets in the way. Your IP: It took him and yours truly eight hours from start to finish, using air tools and a lift to gain access to the header flanges. Here is the lowdown on exhaust manifolds and VALVE SPRINGS. Beyond the engine's amazingly good appearance, Moore had a couple of good reasons for choosing this engine. These are among the best of the iron Ford Windsor heads as they tend to flow much better than earlier castings. If you're going to use the stock 289 heads, install 1.84-inch intake valves, then port the intake and exhaust; these mods will net you about 185 cfm of intake port flow at 0.50 lift. A trip to Orlando Speed World provided us with updated quarter-mile times. First, adding headers will improve power on the existing combination. I'm running BBK un-equal length shorty's, and I'm able to get all the plugs in, tight, and all plug wires on. This will keep you from dropping your overall static compression ratio and losing power. However realistically, with the amount of money spent modifying the gt40p heads or even those older 289 & 351w heads, you could have even better performing aluminum heads. Sure, you could race-port the existing E7 castings, which many have done, but then you're putting quite a bit of change into stock heads. Someone does make the Tri-Y's headers for the early Mustangs using the "P" heads. That said there are some better aftermarket options for heads also. i have a question once i get the gt40p heads from the explorer truck can i also take the exhaust manifolds or headers and fit them in my 66 mustang:?:!?!?!? Richard Rowe has been writing professionally since 2007, specializing in automotive topics. I don't need tons of power to enjoy the car. GT40P heads, what kind of performance do they give? I got a GT40P off the assembly line years ago. 950.00 us a set and will ship . Despite adding 30 degrees of intake duration, this cam improved torque throughout the entire test from 3,000 rpm on up. Posted on May 07, 2014 by promarengine. If you can find individual flanged headers like the obsolete MAC headers had, those worked really well with GT40P's. 68stang351 Founding Member May 16, 2002 850 In a lightweight Fox or early Mustang with a five-speed behind it, this would be a great little street engine. Yeah, except those. a) ain't early and b) aren't 289 heads. We did a quick search for hydraulic roller cams and landed on a COMP camshaft that looked promising. . All manufactured using advanced CNC technology for the extreme durability and precision required of the modern canted valve Ford Small Block at power levels around the 1000 mark reached during recent competitions at the EMC and at the strip. We know what you're thinking--only two-tenths from an extra 45 hp? Keywords Or just play it safe and let the fans ask away about another daring 5.0 TB bolt on or for an exciting surprise, do a LS______ fill in the blanks. SB Ford GT40 Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. K.S. I'll save the effort and lighten my front end by 50# with aluminum. well i finally did my first ever carb build, ive always been an EFI guy Black 1985 GT: 408w, in the 6's in the 1/8 mile. SBF engines are modified constantly. E303 Cam advanced 4 degrees. $700.98. SBF FORD Aluminum Cylinder Heads 302 /351w 190cc 62cc 2.02 /1.60 For ROLLER CAM. Note the head bolt hole issue, some GT40 iron heads had 1/2 holes, if not they will need to be enlarged. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. I have a 432 HP non Hi Po 289 I built. Gasoline/Diesel all makes on earth & still doing it today with great pride.Feel free to contact me anytime. The GT40 heads have thermactor holes built in to connect to the EGR/smog equipment whereas the GT40P heads use an external EGR connective system. Took me 7 hours to do one head.but they cleaned up real nice. When I purchased my "brand new" set of GT40P's, I bought them from an Mustang specific machine shop that used to exist called Central Coast Mustang. Ford's seminal 302 engine (later re-dubbed the 5.0) has been popular with budget-minded hot rodders for decades. #2::: Get advice from a reptile engine builder with experience(first flag for me is when somebody refers to an ENGINE as a MOTOR! With gt40p heads and 289 hipo exhaust manifolds changing sparkplugs is the same as the original 302 heads and manifolds, I use the spark plugs that are recomended for the explorer with gt40p heads and you can use straight or angled boots. GT40Ps have 58cc. If we subtract the 20 hp that the fan is worth, we end up with a gain of 25 hp. Most of them are aware of what changes need to be completed. The combination of this cam with your intake and headers will produce a very nice street engine. I'm sure the dyno operator used some goofball correction factor to make the numbers look higher. 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. There's not a lot of reson to use 351 heads later than '75 since they essentially identical to 302 heads except for head bolt holes. 402 HP NA from a HI PO 289 isnt that mysterious of a feat to accomplish with todays SBF Aftermarket parts availability. Ford GT40P 302 5.0L 4 Bar Cylinder Head Assembly Pair w/ 1/2" Head Bolt Hole. Using the manufacturer recommended springs for your camshaft are a safe bet. Depending on the Headers you have you might be okay. On the power side, we selected 400 hp as an impressive but reasonable output for our small-block 5.0L Ford. 1983 Mustang G.T. For real performance, stock E7TE heads leave a lot to be desired. GT40, GT40P, would be great factory heads. Tim's junkyard refugee survived the beating and we had a bitchin' story. Not *as* good as the GT40p heads, but I'd prefer to not have to worry about exhaust fitment issues, or have a narrow range of what I can work with. The tube headers showed a gain of almost 100 hp! As with all head installations, check piston-to-valve clearance before final startup. Come join the discussion about performance, builds, modifications, reviews, engine swaps, classifieds, troubleshooting, maintenance, and more! VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. With nitrous, this is easily a mid-11-second ride. Come join the discussion about performance, production numbers, VIN decoders, modifications, troubleshooting, power adders, DIY tutorials, and more! i have a 302 engine from a 1977 granada and i am wondering if gt40p heads from an explorer will fit on this motor. I have to agree, the GT40P heads flow better than the GT40 iron heads. When building an engine there is a lot to take into consideration. You can have your current 28 oz rebalanced to 50. For this reason, we're not sure what kind of boost the GT-40P heads will give. 1986 Short block with notched pistons. They also have emissions legal heads as well. What did the heads flow? This pushed that little Ford to a peak horsepower of 503, and that was where we stopped. . At 4,300 rpm, the torque peaked at 348 lb-ft, a solid 20-lb-ft improvement, and the Lunati continued to outperform the stock cam all the way through with a peak horsepower increase of 60 hp at 354 hp at 5,700 rpm! Ford offered a performance head that was a stock part on 1993-1995 Mustang Cobra models and pre- 1997-1/2 Ford Explorers and Mercury Mountaineers equipped with the 5.0 L engine called the GT-40 head (casting ID F3ZE-AA). Runs well. In addition, the cam timing was designed for torque, with duration somewhere around 190 degrees at 0.050 with roughly 0.450-inch lift. After we installed the heads and with the fan off, he ran a 12.46 at 107.9. Real world data seems to show that GT40 or GT40P cylinder heads, assuming no other mods on your Foxbody, are good to add anywhere between 20-40 HP (over stock heads). This will follow the guideline of a 1.6 rocker baseline and factory bottom end 79-95 related 5.0L Mustangs only. After graduating from Iowa State University with a journalism degree in 1978, he combined his two passions: cars and writing. We bolted the Ford to the dyno with a set of 158-inch long-tube headers and an 18-inch collector extension to help the low-speed torque, then we fired up the small-block. While the heads were off getting a massage, we turned our attention to the cam timing. How to Build a Budget 383 Stroker Chevy How do I Increase Horsepower on a 440 Cylinder Head Specifications for a 1969 How to Get More Power Out of a 92 4.3 dragster engine image by Robert Young from, Copyright 2023 Leaf Group Ltd. / Leaf Group Media. P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. We've already been motivated to put this engine in a buddy's Mustang. If they are cheap enough, take them anyway. Building a 302-inch small-block to produce 400 hp is really no big deal, but doing. The reason for this is that we're actually replacing mildly worked E7TE heads. (Image/Harrison Creamery). The specs are a conservative 212/218 degrees of duration at 0.050-inch tappet lift but offer a really nice 0.512-inch valve lift for both the intake and exhaust. people can stop saying that adding aftermarket cam with stock heads is a waste of time. Free shipping. I'll prob take a trip up there this weekend after scavenging the junkyards, thanks a million. This is a function of the somewhat wider lobe-separation angle of 112 degrees. Ha! For a better experience, please enable JavaScript in your browser before proceeding. 68 XR7 & 68 M-100. many thanks to all you eco-hippies giving me dirty looks and helping me feel llike an overall badass rebel. But don't think that adding a bigger camshaft will make more power. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. In less than an hour, we were ready to test. The Fora platform includes forum software by XenForo. One benefit gt40P head will have over other 80's-90's model heads, including the gt40 head, is that it has a smaller combustion chamber much like the original 289 heads. HiPo manifolds and Ill be good. Install a Ford Motorsport E303, X303 or F303 cam, or any of the similar units from Indy, Lunati or your favorite manufacturer.
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